body{
    background: rgba(0,0,0,.8);
}
.father{
    width: 1000px;
    margin: 50px auto;
}
.child{
    width: 1000px;
    margin: 0 auto;
    color: darkseagreen;
    font-size: 28px;
}
label{
    font-size: 42px;
    font-weight: 700;
    color: #fff;
    vertical-align: middle;
}
.inputText{
    width: 40%;
    height: 40px;
    line-height: 40px;
    border:1px solid deepskyblue;
    border-radius: 5px;
    margin-right: 10px;
    padding-left: 15px;
}
button{
    width: 60px;
    height: 40px;
    background: #eaeaea;
    border-radius: 5px;
    font-weight: 700;
}
.box{
    color: #fff;
}
.show{
    opacity: 1;
    /*animation: show-item 1s linear forword;*/
    transition: all 1s linear;
}
.hide{
    /*opacity: 0;*/
    /*transition: all 1s linear;*/
    animation: hide-item 2s linear forwards;
}
@keyframes hide-item {
    0%{
        opacity: 1;
        color: red;
    }
    50%{
        opacity: 0.5;
        color: green;
    }
    100%{
        opacity: 0;
        color: blue;
    }
}